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Former Sen. Judd Gregg (R., N.H.) was tapped Monday to head the Securities Industry and Financial Markets Association, joining a list of Washington insiders hired by Wall Street firms and their trade groups to help combat regulatory and political pressure.

''When I saw iron, I thought, 'Wow -- that's an energy source for microbes. There has got to be microbes associated with that,' '' said Jill Mikucki, geomicrobiologist at Dartmouth College and lead... 0